Mechanical impulse regenerator



July 27, 1948. o. w. HENRIKSVON ET AL 2,445,829

MECHANICAL IMfULSE REGENERATOR 7 Filed Sept. 20, 1944 5 Sheets-Sheet 1 FIG. 5

IN VEN TORS. HERBERT E OBERGF ELL DECEASED BY AMANDA OBERGFELL, EXECUTRIX OSCAR W. HENRIKSON ATTORNEY y 1948- o. w. HENRIKSON ET AL 2,445,829

MECHANICAL IMPULSE REGENERATOR Filed Sept. 20, 1944 3 Sheets-Shet .2

INVENTORS. HERBERT F. OBERGFELL,DEOEA5ED BY AMANDA. OBERGFELL,EXECUTRIX OSCAR W. HENRIKSON aZZ MTORNEY y 1948- o. w. HENRlKON ET AL 2,445,829

MECHANICAL IMPULSE REGENERATOR Filed Sept. 20, 1944 3 Sheets-Sheet 3 HERBERT F. OBERGFELL, DECEASED BY AMANDA OBERGFELL, EXEOUTRIX OSCAR W. HENRIKSON FIG.3

ATTORNEY INVENTORS.

Patented July 27, 1948 MECHANICAL REGENERATOR Oscar W. Henrikson, Chicago, and Herbert F. Obergfell, deceased, late of River Forest, 111., by

Amanda Obergfell, executrix, River Forest, 11].

assignors to Automatic Electric Laboratories, Inc., Chicago, 111., a corporation of Delaware Application September 20, 1944, Serial No. 554,912

16 Claims.

The present invention relates in general. to automatic telephone systems and more particularly to improved impulse receiving and regenerating repeaters.

The main object of the present invention is the provision of an improved mechanical impulse repeater for receiving a plurality of series of incoming impulses and for retransmitting these impulses after the incoming series have been mechanically registered. 4

One of the features of the improved repeater relates to the provision of two separate stepping magnets which are operated simultaneously or separately in response to incoming impulses over two separate circuits for operating a differential gearing arrangement which in turn operates a selecting member one or two steps dependent upon whether only one magnet is operated or both magnets are simultaneously operated.

Another feature relates to the improved sending mechanism for controlling the retransmission of outgoing impulses. I

Other features of the invention relate mainly to the detail construction and arrangements of the operating mechanisms of the mechanical repeater and will be apparent from the following description and in the claims.

This mechanical impulse repeater along with a push button calling device, being claimed in a copending application, S. N. 551,010, filed August 24, 1944, was designed primarily for use by a person who originates a large number of outgoing calls, such as a salesman, an order clerk, or a P. B. X operator who completes outgoing trunk calls from a local private exchange to automatic subscribers accessible through automatic switches in the main exchange.

A subscribers line equipped with this pushbutton calling device and mechanical impulse repeater may set up, or key, the digits of the called number without waiting for the automatic switches. The mechanical impulse repeater is individual to the subscribers line and impulsing may proceed as soon as the receiver is removed. The repeater receives and mechanically registers the called digits until such time as the automatic switches are ready to receive impulses at which time the registered digits are retransmitted by the repeater. I

The push button calling device is arranged to transmit both loop and ground impulses and an intervening circuit, shown in a copending application Serial No. 559,878, filed October 23, 1944, now Patent 2,418,609, issued April 8, 1947, between the repeater and the calling device, translates the coded transmitted impulses from the push button calling device and operates the two impulse re- 'ceiving magnets 01' the repeater to register successive digits. Loop impulses from the calling de vice cause simultaneous operation of both receiving magnets to operate the selecting member of the repeater a distance corresponding to two steps while a ground pulse from the calling device operates only one of the receiving magnets to opcrate the selecting member only one step. The mechanical dial repeater takes two steps for each loop pulse and only one step for each ground pulse to register the incoming digits transmitted in code from the push-button calling device. When the automatic switches are in condition to receive impulses, the sending mechanism of the repeater is operated step by step to transmit standard loop pulses in accordance with the digits registered in the mechanical repeater. The automatic switches are operated in response to thesedigits to com-- plete the desired connection. I

Referring now to the drawings:

' Figure 1 shows a front view of the mechanical dial repeater.

Figure 2 shows a cross section of the repeater taken on the line AA of Figure 1. I

Figure 3 shows a cross section of the repeater taken on the line BB of Figure 1.

Figure 4 shows a cross section of the repeater taken on the line C-C of Figure 1.

Figure 5 shows an assembly view of the sending member of the repeater.

Figure 6 shows a side view of the pivoted pin restoring arm of the sending member shown in Figure 5.

Figure 7 shows a side View of the base portion of the sending member shown in Figure 5.

Figure 8 shows an end View of the base portion of the sending member shown in Figure 7.

Figure 9 shows a cross section of the differ.- ential gearing arrangementon the shaft for operating the selecting member. I

Referring now to the drawings showingthemechanical dial repeater, the frame comprises a plurality of vertical mounting plates IOI, I02, I03 and I 0'4 which are separated the required distarices by means of the studs I 05. The studs I 05,

I as shown, are secured to the mounting plates by repeater to the frame. Sending magnet SM is mounted on a turned edge of plate IOI and has an operating armature arm I08 on which the stepping pawl I33 is pivotally mounted. A restoring spring H5 is secured to the armature arm I08 by means of a pin. andto the adjusting member H6. The member H is adjustable for variably tensioning restoring spring H5. The construction of this magnet, as well as stepping magnets RMI and RM2, is substantially the same as that shown and described in the Erickson Patent 1,794,888. Stepping magnet RMI. is mounted on a. turned edge of end mounting plateI02 and has a similar armature operating arm I I3, pawl I I4, re:-

storing spring IIS and adjusting member I203 Stepping magnet RMZ is mounted on a turned edge of mounting plate I04 and also has a-similar' armature operating arm III, pawl II2, restoring spring II! and adjusting member I I8,

Associated with each stepping pawl is an adjustable: stop: I 2|, such as shown in Figure 4: Each s'uchstop isadjustably mounted to its'associated' mounting plate by means of a slot in such plateand by means-ofscrews; suchas screws I 22 to :limit the oper-ating troke of the armature arms,.such as armsII3,.III-and I08.- A holdingdetent', such as :detent I 30isalso provided for en: gagement with the'teeth ofthe ratchet wheels to maintain the: ratchet wheels in their operated. positions.v

A- pinrestoring magnet 'PRM is mounted on plate-I03'by'meansof screws I23'and' I24. A pin restoring armature I25 is-mounted on the-heel pieceiof'pin restoring magnet PRM, as shown, and its operating stroke is -made adjustable by the adjusting" nuts and screws 'ateach end thereof; SpringJIZW normally holds the armature I25'in the position shown. Pin setting magnet PSM' issimilarly mounted nonmounting plate I 04 and has a similar "pin setting armatureIZ'I and restoring spring I28.

Brass bearings: I3I are ring staked'in holes in mounting plates. I04 and I02 to providebearing surfaces for rotatable shaft I3 2. Miter. gears I33 and: I34 of the differential gearing arrangement are rotatably mounted on shaft I 32. The ratchet wheel I35 is prong stakeclto miter gear I33 to make it a unitar assembly. The ratchet wheel I36'is'simi1arly prong-staked to miter gear I34. A miter pinion I3'Tmeshes' wit-h'miter gears- I33 and. I 34' and is rotatably mounted on bolt I30 which is secured to theshaft I32 as shown in Figure 9;. The ratchet; wheels and their associated miterge'ars are rotated on the shaft I32by stepping magnets RMI and RMZ and each miter gear rotates-the miter'pinion I31 to cause rotation of shaft I32. With thistype of gearing, the rotation of either miter gear I33 or I34 alone one step in turn rota-tesmiter' pinion I31 and shaft I32 one step while the simultaneous rotation of both miter gears one step causes the miter pinion I33 torotate the shaft a distance corresponding to two steps: The shaft I32 is hollow and an operate rod I40 extendsthrough the hollow shaft for the purpose of operating the operate arm I50 of the pinrselecting member when the pin setting magnetPSM- operates its armature I21.

Thepin'selectin'g member comprises in part a flat arm- I42 having a collar I4I brazed thereto and secured to the shaft. I32 by means of a set screw I46. In addition a hexagonal nut I45 is screwed on threads on shaft I32 to hold the selecting member 'in place duringits rotation with shaft I32. The lower extremity of arm I 42,- as seen in Figure 1, has ears I44 bymeans of which the operate arm I50 of the selecting member is pivotally mounted on arm I42. The upper extremity of arm I42 is turned at right angles to form extension I43 in which a rectangular hole, not shown, is provided for sprin I43. At the outer left hand extremity of extension I43 two arms I41 are provided, one on each side of operate arm I50 for keeping arm I50 aligned with arm I42 during rotation of shaft I32. The operate arm I50 is a substantially channel-shaped member having ears I5l at its lower extremity for pivotally; mounting. arm I50 to arm I42. At its upperextrerhityarm I50 has a flat extension I52 which is rotated over the circular row of pins stow shaft 132i Arm I50 is pivoted by the operation' of" pin setting magnet PSM to displace one of the pins I00. The spring I40 is secured to arm I50 by means of machine screws and is tensioned'so as to normally hold arm I50 against a cross member of I43 extending between the arms I41. Therodr'I 4-0-normally abut-sagainst the back of"arm.l5il;.as shown, and pivots the arm I50- on its-ears, I5I- when: armature I2! is operated.

Near the center of operate arm I50, two pins I10 extendthrough elongated slots in arm I50 for the purpose ofi'rotatingacam' I7 I in unison with arm I50. A brass bearin Il2-is ring-staked to mounting'plate I03't'o provide a bearinghole for cam shaft I152 Gircular'plate I73, to-which pins H0 are secured, is integral with cam shaft I 'ItI'and' the collarassembly [15 including cam I'II' is secured to the cam shaft I "Mby means ofa setscrew. Due to the pins- I"I0=- extending through holes in arm I55-rthe cam I 1I isrota-ted in unison with the operate-,ar m- I50 andshaft I32. Cam I'I'Iis-prOVided foropera-tingsa set of contacts included in a circuit' which controls the transmission of outgoing impulses. Thissetoff springs is closed aslong as the selecting arm and: the sending [arm are in non-corresponding positions and are open when sucharmsare in corresponding positions.

A disk-shaped plate I (His secured to mounting plate I 03..by,-means of machinescrews I 62 and the flanged portionaof disk-shaped plate [0| is drilled with a; circular row" of. holes through "which the pinslfiIl'extend. Themoun'ting plate I03 is also drilled With a corres'ponding row of'holes in alignment with the holesinuplate I5 I Acircular row of pins. I50; ,seventyin number, extend through thesealigned holes andare normally held in place by spring I53 which islocated'between the flange portion-of disk-shaped plate ISI and mounting plate I03.-

A brass bearing I2 0 is ring-stakedinto a hole inmounting-plate I0 I in which the sending shaft I'I'I rotates. Integral with this shaft is a ratchet wheel II-8 having teeth for engagement by pawl I09 and holding detent I 30. The shaft H1 is hollow and, a rod- IT'S-extends through the hollow shaft: and bears against the pin restoring arm I 90 of the sending member. The right hand end of shaft IT! is threaded and a hexagonal nut I is screwed thereon to hold the sending member in: place. 1

r Thesending. member assembly is best shown in Figures 5 to 8, inclusive, and comprises a collari I8-Iwhich-is secured to shaft ITI by means of "a: set-screw and to the base of sending arm I82 by brazing so as to rotate in unison with ratchet wheel- Il8'. and shaft I-I'I' when sending magnet SMoperates armaturearm. I08 and paw] I 09; Turned;ears. I 84 are provided at one end of sending arm I82 for pivotally mounting the pin restorin-ggarm I and the other end of arm I82- is bent at right angles forming an extencontact I92 is mounted in engagement with spring I93 and is provided to wipe over the conducting ring I95 mounted on plate I9I. Sprin contact I94 is provided for operation by cam.

I'II when the sending member and selecting member are in corresponding positions. The pin restoring arm I99 of the sending member is pivotally mounted on the base arm I92 by means of cars I99 and a pin at one end. At the other end an extension I99 is provided with a turned edge for engagement with a displaced pin I99. Springcontacts I91 and I98 are mounted on extension I99 as best shown in Figures 5 and 6. These contacts are normally closed and are separated in response to the rotation of arm I99 into a displaced pin I99. The arm I 99 is rotated step by step with arm I92 by stepping magnet SM over the path of circular pins until such time as spring I91 engages a displaced pin to stop such operation as will be more fully described hereinafter.

A disk-shaped plate 299 is mounted on mounting plate MI by means of screws 29I over ratchet wheel I18 and is provided with a hole near its center through which the shaft I11 extends. The conducting ring I95 separated by a pair of insulating rings 299 is mounted on to the plate 299 by means of metal ring 299 and screws 295. Spring contact I92 continually wipes over this conducting ring I95 to complete the transmission circuit which terminates on the terminal I 95. I I

Having iven a description of the detailed construction of the various parts of the mechanical dial repeaters, a brief description will now be given of the operations which take place in response to the receipt of incoming impulses and of the operations which take place during retransmission of the outgoing impulses.

Impulses transmitted to rotary magnet RMI causes the operation of its armature H3 and pawl IM to rotate ratchet wheel I99 and its associated miter gear I99 one step for each in1- pulse received. In a similarmanner impulses transmitted to rotary magnet RM2 causes the operation of its armature III and pawl III 2 to rotate ratchet wheel I35 and its associated miter gear I93 one step for each impulse received. The rotary magnets RMI and RMZ may be independently or simultaneously operated, and, in the present example, are simultaneously operated, except for the last impulse on the odd digits, of all digits transmitted to the mechanical dial repeater. The miter pinion I31 rotates each time either miter gear I33 or I39or both are rotated and causes the shaft I32 and pin selecting member to rotate a corresponding distance. For example, if only one rotary magnet is operated, the miter pinion I31 operates shaft I32 and pin setting arm I59 of the pin selecting member one step from one pin I99 to the next adjacent pin I99. In case both rotary magnets are simultaneously operated then the miter pinion I91 rotates the shaft I 92 and pin setting arm I59 a distance equivalent to two steps from one of the pins I99 past the next adjacent pin to the next subsequent pin I99. The pin selecting member is therefore rotated one step when only one magnet alone is operated and is rotated two stepswhen both magnets-are simultaneously operated. Inlresponse to. the incoming impulses to rotary magnets RMI and RM2,the pin selecting arm is rotated stepyby step in accordance with the number of incoming impulses to select one of the pins I99 in the circular row. 9

After receipt of the train of impulses oorre-.

spending to the transmitted digit, pin setting magnet-PSM operates its armature I21 topush rod I99 and pivot pin setting arm I59 on. arm I92 to displace the selected pin IBIJ. After release of magnet PSM, the displaced pin is maintained in its displaced position by spring I63. The pin setting arm I59 restores in response to the release of armature I21.

Further incoming digits operate the rotary magnets RMI and RM2 to select and displace corresponding pins I99 in the same manner as just described to register or store the incoming digits.

Cam I'II was also rotated in unison with pin setting arm I59 and closed contacts I93 and I94 to prepare the circuits for the transmission of outgoing impulses as soon as it moved out of the position corresponding to the occupied position of pin restoringarm I99.

Registration of the incoming digits takes place in the manner described above and the retransmission of these registered digits may take place during or after registration dependent upon .whetherthe train of automatic switches is ready to receive the retransmitted digits.

As soon as the automatic switches are ready to receive impulses a circuit is completed through pin spring contacts I91; I99 and cam spring contacts I99 and I94 for causing the intermittent operation and release of sending magnet SM.

' Sending magnet SM operates its-armature I98 and pawl I99 to rotate ratchet wheel I18, shaft I11 and the sending member comprisingarms I92 and I99 one step for each operation of magnet SM. Pin restoring arm I99 rotates step by step over the pins I99 until spring contacts I91 and I99 are separated by spring I91 engaging the first; displaced pin. This spring contact separation stops further operation of sending magnet SM and shortly thereafter pin resetting magnet PRM is momentarily operated. Magnet PRM operates its armature I25 to'push rod I19 against pin restoring arm I99 whereby arm I99 is pivoted to restore the engaged displaced pin. When armature I25 restores in response to the deener- I gization of magnet PRM the spring I9I restores the pin restoring arm I99 and rod I19 to normal. Spring contacts I91 and I98 again close to complete the circuit for causingthe reoperation of sending magnet SM. Magnet SM is again intermittentlyoperated to again step the pin restoring arm I99to the next displaced pinwhere spring contacts I91 andI98 are again openedto stop thestepping operation of magnet SM. Magnet PRM is again operated to restore the engaged displaced pin. Sending magnet SM is operated once for each outgoing pulse transmitted and retransmits the registered digits as determined by the displaced pins. Theseparations of spring contacts I91 and I99cause the transmitted impulses to be divided into groups in accordance with the registered digits. The operation continues as above described until the pin. restoring arm I99 and arm I92 of the sending member catches up to and reaches a position corresponding to the now occupied position of pin setting arm I59 of the pin selecting member. When the arm I82 reaches this corresponding position the cam springs I 93 and I94 are opened by engaging the cam on cam III thereby opening the circuit for causing the operation of sending magnet SM. Cam springs I93 and I94 are therefore opened in response'to the retransmission of the last pulse of the last registered digit. The apparatus remains in this position until a new series of digits is registered in the repeater at which time cam springs I93 and I94 are again closed by the first step of cam III in response to the first received impulse.

Having described the invention, what is considered new and is desired to have protected by Letters Patent will be set forth in the following claims.

What is claimed is:

1. In a repeater, the combination of a first and a second stepping magnet each operated in response to a train of incoming impulses, a plurality of marking devices, a setting device for selecting said marking devices, driving means controlled by the operation of said magnets whereby said setting device is operated one step by each magnet in case said magnets are independently operated and whereby said setting device is cumulatively operated a plurality of steps in case both said magnets are simultaneously operated, means for operating the marking device selected by said setting device in accordance with the occupied position of said setting device at the end of said train of incomin impulses to effect a marking, and means including a sending magnet operated in accordance with said operated markings.

2. In a repeater, the combination of a first and a second stepping magnet each operated in response to a train of incoming impulses, a setting device cumulatively operated in response to the total number of operations of both said first and second stepping magnets, a plurality of marking devices, a particular one of said marking devices selected dependent upon the occupied position of said setting device at the end of said train of incoming impulses, means for operating the selected one of said marking devices at the end of said train of incoming impulses to effect a marking, and means including a sending magnet operated in accordance with said operated marking.

3. In a repeater, the combination of a first and a second stepping magnet each operated in response to a train of incoming impulses, a plurality of marking devices, a setting device for selecting said marking devices, differential gearing mechanism intermediate said setting device and said stepping magnets for stepping said setting device one step in response to the operation of one of said magnets and for stepping said setting device two steps in response to the operation of both said magnets, means for operating the marking device selected by said setting device in accordance with the occupied position of said setting device at the end of said train of incoming pulses, a stopping device associated with said marking devices, and a sending magnet for operating said stopping device until said operated marking device is reached.

4. In an impulse receiving device, two frame members, a bearing secured in each of said members, a shaft rotatably mounted in said bearings, a first ratchet wheel and miter gear assembly rotatably mounted on said shaft, a second ratchet wheel and miter gear assembly rotatably mounted on said shaft, means including said ratchet wheels forindependently or simultaneously rotating said first and second miter gear assemblies on said shaft in response to incoming impulses, a miter vice secured to said shaft and rotated therewith to make a selection, a rod extending through said shaft to said selecting device, and means for operating said rod to further operate said selecting device to complete said selection.

5. In an impulsereceiving device, a rotatable shaft, means including a first stepping magnet and a second stepping magnet each operated by incoming impulses to rotate said shaft one step for each magnet operation, a selecting device secured to said shaft and rotated therewith to make a selection in accordance with the total number of impulses transmitted to said stepping magnets, a rod extending through said shaft to said selecting device, and means for operating said rod to further operate said selecting device to complete said selection.

6. In a repeater, a plurality of movable marking devices each having a normal position and a marking position, a selecting device for selecting said marking devices, a first and a second stepping magnet operated in response to a train of incoming impulses, interconnecting mechanism between said selecting device and said stepping magnets for stepping said selecting device one step in response to each operation of one of said magnets or for stepping said selecting device two steps in response to each simultaneous operation of both said magnets, said electing device thereby selecting a particular one of said marking devices in accordance with the occupied position of said selecting device at the end of said train of incoming impulses, means for operating the selected one of said marking devices from its normal position to its marking position to effect a marking, a stopping device associated with said marking devices, a sending magnet for operating said stopping device step by step until it engages said operated marking device in its marking position, and contacts carried by said stopping device operated by said engagement for stopping further operation of said sending magnet.

7. In a register sender, a movable member having a plurality of positions, movable pins arranged in the path of said member, there being a movable pin for each position of said member, a first and a second stepping magnet for moving said memher two steps from one position through its next position into its next succeeding position in response to an incoming impulse to each of said magnets, a pin setting magnet operated to displace a pin corresponding to the position occupied by said member at the end of a series of incoming impulses, a sending member operable in the path of said pins, said sending member having positions corresponding to each position of said movable member, a sending magnet for operating said sending member, means controlled by said displaced pin for stopping said sending magnet and said sending member in the position corresponding to said displaced pin, and a pin restoring magnet operated in response to said sending member being stopped in said last mentioned position for restoring said displaced pin.

8. In a repeater, a movable member having a plurality of positions, movable pins arranged in the path of said member, there being a movable pin for each position of said member, electromagnetic means operated in response to a train 2 of incoming impulses for operating saidmember step-by-step through its positions, a pin setting magnet operated to displace a, pin corresponding to theposition occupied by said member at. the

end of a trainof incoming impulses, a sendingmember operable in the path of said :pins and having positions corresponding to each position i of said movable member, a. sending magnet for operating said sending member step-by-step,

means controlled by said displaced pin .for stopping the step-by-step operation of said sending member in the position corresponding to said dispin for each position of said member, electro magnetic means operated in response to a train of incoming impulses for operating said member step by step in accordance with the number of impulses in said train from its last position to a new position, a pin setting magnet beingoperated .to displace a pin corresponding to said new position of said member at the end of said train of incoming impulses, a sending member operable in the path of said pins and having positions corresponding to each position of said movable member, a sending magnet for operating said sending member step by step, and a pair of nor-. mally closed springs carried by said sending mem-.

ber and operated by the engagement of said sending member with said displaced pin for stopping the step-by-step operation of said sending member in the position corresponding to said new position.

10. In a repeater, a movable member having a plurality of positions, movable pins arranged in the path of said member, there being a movable pin for each position of said member, electromagnetic means operated in response to a train of incoming impulses for operating said member step by step in accordance with the number of impulses in said train from its last position to a new position, a pin setting magnet being operated to displace a pin corresponding to said new position of said member at the end of said train of incoming impulses, a, sending member operable in the path of said pins and having positions corresponding to each position of said movable member, a sending magnet for operating said sending member step by step, a pair of normally closed contacts carried by said sending member and operated by the engagement of said sending member with said displaced pin for stopping the step by step operation of the sending member, a cam operated in unison with said movable member, and another pair of contacts carried by said sending member cooperating with said cam and connected in serial relation with said first mentioned pair of contacts for also controlling the step by step operation of said sending member, said other contacts being closed when said movable member and said sending member occupy non-corresponding positions and being opened by engagement with said cam when said movable member and said sending member reach corresponding Positions.

11. In a repeater, a selecting member having a plurality of positions and normally remaining in its last occupied position, electromagnetic means operated in response to a train of incoming impulses for operating said member step by step from its last positionto a new position, asemr ing member having positions. corresponding to each position ofsaid selecting member and also. normally remaining in its last occupied position, a sending magnet for operating said sending member step by step until it reaches the position corresponding to the new position of said.

selecting member, a plurality of pairs of contacts carried by said sending member for controlling the operation of said sending 'magnet, a cam associated with said selecting membercontrolling the operation of one of said pairs of contacts whereby said one pair of contacts are closed'as long as said selecting member andsaidsending member are in non-corresponding.positions and are opened in response to said sending member reaching the position correspondingtofthe position occupied by saidselectingmember, and obstruction means selected and. operated by said selecting member insaid new position controlling the operation of the other of said pair. of contacts whereby said other pair of contacts: is

opened in response to said sending member X reaching the position corresponding to said new position regardless of whether said selecting member has been moved from said: new position in response to another train of. incomingim- L pulses.

12. In a repeater, a selecting member having a plurality of positions and normally remaining in its last occupied position, electromagnetic means operated in response to a train of incoming impulses for operating said member step by step from its last position to a new position, a. sending member having positions corresponding to each position of said selecting member and also normally remaining in its last, occupied position, a

sending magnet for operating said sending member step by step until it reaches the position corresponding to the new position of said selecting member, a plurality of pairs of contacts carried by said sending member for controlling the operation of said sending magnet, one of said pairs of contacts being closed as long as said selecting member and said sending member are in noncorresponding positions and being opened in response to said sending member reaching the position corresponding to the position occupied by. a

number of impulses in said train from its last position to a new position, a sending member having positions corresponding to each position of said selecting member and also normally remaining in its last occupied position, a sending magnet for operating said sending member step by step until it reaches the position corresponding to the new position of said selecting member, and a plurality of pairs of contacts carried by said sending member for controlling the operation of said sending magnet.

14. In a repeater, a pluralityof movable pins, means including a first and a second stepping magnet operated independently or simultaneously in response to incoming impulses to make a step-by-step selection by selecting one of said pins in accordance with the number of received impulses, a pin settingmagnet energized and released after receipt of said incoming impulses .for completing said selection by displacing said selected pin, a sending'magnet, a sending member operated step by step by said sendingmagnet a plurality of steps until said displaced pin is reached and a pin restoring magnet operated after said displaced pin is reached by said sending member for restoring said displaced pin to normal.

15. In a repeater, means including a first and a 1 second steppingmagnet operated independently or simultaneously in response to incoming impulses to make a step-by-step selection in accordance with the number of received incoming impulses, an operate magnet operated after receipt of said'incoming impulses for completing said selection, asending magnet, a sending member operated step by step by said sending magnet a a plurality of digits in response to th'recei'pt of a plurality of incoming'series of impulses, a sending member, means for'stepping said" sending member one step at a time for each incoming I impulse of each digit received and for successively rotating said sending memberin a plurality of series'of steppingoperations to corresponding positions, impulse transmitting means fortransmitting a digit in accordance with eaehsuccessive rotation of said sending member, and means whereby said selecting member may 'be in motion to register a subsequent digit at the same time that said sending member is in motionto transmit a prior registered digit. V

- I OSCAR W. HENRIKSON.

AMANDA OBERGFELL, Ewecutrz'a: of the Estate of Herbert E. Obergfell, Deceased.

REFERENCES CITED,

The following references are of record in the file of this patent:

I UNITED STATESPATENTS Number Name Date 2,154,776 Saville et a1 Apr. 18, 1939 2,188,461 McCleW et al Jan. 30, 1940 2,301,822 Shepherd Nov. 10, 1942 2,303,918 Dimond Dec. 1', 1942 2,322,848

, Hibbard June 29, 1943 

